budget? no. of cores for chip? usage for d rig? 

Below RM1k not into gaming?

How about: 
PHENOM II X2 555 - RM319
2GB KINGSTON PC1333 - RM134
ASUS M4A88T-M/USB3 - RM345
SAPPHIRE HD4650 512MB DDR2 - RM180
TOTAL = RM978

i'm not so sure d pricin in mesia but rm1k budget is a bit tight. so dun expect quad core + 890 series board + hp ddr3 + 5 series gfx.

u can start off w/ 7 series but considerin ahsos 880 evo is kinda cheap over there u mite as well start with a bang (well, i mite sound abit exaggerated but i consider this board is quite ok apart from d undervolt/overvolt issue). to me, mobo is one of d most crucial components in oc, chip & ram wise u can settle for lower end 1st while learnin & upgrade after ur more comfortable w/ tweakin. 

m4a88td-v evo - brand new RM3xx
x2 240 - ~RM200
4GB Team Elite DDR3 1333 - brand new RM3xx
GFX - ermmm... 2nd hand 4830 mebe

if all get 2nd hand mite be able to meet ya budget... my humble 2 cents... 

Bro sang_karim, you may try:-

CPU: AMD Athlon II X2 5000+ RM230 (Find Mika) <---can unlock to quad core and also a great overclocking chip
Mobo: GIGABYTE MA74GM-S2 RM175 (Find Mika)
RAM: 2GB KVR PC800 DDR2 RM130 (Czone)
PSU: FSP SAGA 450W RM165 (Czone)
GPU: 512MB Sapphire HD4650 128Bit RM180 (Czone)
Optical Drive: LG 22X DVDRW RM63 (Jayacom)

Total: RM943

Just test it using prime95 lah bro for an hour, if it can pass then surely there would be no prob for normal usage